<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>何为数据代理</title>
</head>
<body>
<!--  数据代理: 通过一个对象代理对另一个对象中属性的操作 (读/写)  -->
<script type="text/javascript">
    let obj = {x:100}
    let obj2 = {y:100}

    Object.defineProperty(obj2,'x',{
        get(){
            return obj.x
        },
        set(value){
            obj.x = value
        }
    })
</script>

</body>
</html>